含静止无功发生器的直驱风电并网系统稳定性分析及振荡抑制策略

风电并网系统稳定性分析及振荡抑制策略大多集中于风电场本身，针对含静止无功发生器(SVG)的直驱风电并网系统研究较少。基于特征值灵敏度筛选出对含SVG的直驱风电并网系统稳定性较显著的控制通道，然后基于独立通道分析设计理论将并网系统由多输入多输出耦合系统等效拆分为多个单输入单输出控制通道，在定性分析并网系统稳定性的同时定量评估不同控制通道间的交互作用程度。为抑制控制通道间的交互作用，提出了基于H∞鲁棒控制的次同步振荡抑制策略。通过电磁暂态仿真，验证了基于独立通道分析设计理论分析并网系统稳定性的正确性以及基于H∞鲁棒控制的次同步振荡抑制策略的有效性。

Stability analysis and oscillation suppression strategy of direct-drive wind power grid-connected system with static var generator

Most of the stability analysis and oscillation suppression strategies of wind power grid-connected system focus on wind farm itself, but less research is implemented for direct-drive wind power grid-connected system with static var generator(SVG). The control channels that have a significant impact on the stability of grid-connected system are screened out based on eigenvalue sensitivity. The grid-connected system is equivalently split into multiple single-input single-output(SISO) control channels from a multi-input multi-output(MIMO) coupled system based on the individual channel analysis and design(ICAD) theory. The stability of the grid-connected system stability is analyzed qualitatively while the interaction between different control channels is evaluated quantitatively. A sub-synchronous oscillation suppression strategy based on H∞ robust control is proposed to suppress the interaction between control channels. Through electromagnetic transient simulation, the correctness of the grid-connected system stability analysis based on the ICAD theory and the effectiveness of the sub-synchronous oscillation suppression strategy based on H∞ robust control are verified.